It is used to represent factorial. For example, n! is equal to n(n-1)(n-2)(n-3)...(1).
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The exclamation mark in maths means factorial, which means you have to multiply the number by all the integers which are less than it, like 4! means 4*3*2*1, which is 24.
The exclamation point is the symbol for the factorial function. For integer values of n, n! = 1*2*3*...*n The factorial is critical for calculating numbers of permutations and combinations.
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Of all the things that an exclamation mark can convey, uncertainty would not be one of them. You may use a question mark to convey uncertainty within or outside of a parenthetical.
The exclamation mark almost always indicates factorial, i.e. n! = 1*2*3*...*n. Therefore 4! would be 1*2*3*4 = 24. Additionally, the exclamation mark can indicate negation, e.g. in computer programming and logic.